SOIL MOISTURE AND WILTING 



127 



in table 3. These results bring out, perhaps in a still more con- 

 vincing manner, the same generalization as that indicated above. 



TABLE 3 



Percentage of water left in the soil by the same plants of Martynia wilting tinder 



different rates of evaporation 



Physalis angulata var. linkiana Gray. This plant grows spon- 

 taneously near the Desert Laboratory under the same conditions 

 as does Martynia, and it also is well suited to stand high evapor- 

 ation rates. Similar plants of this species, which had been 

 grown together in the open, were placed under the various con- 

 ditions previously described and allowed to wilt. The percent- 

 age of water left in the soil in each case is given in table 4. The 

 results are quite similar to those given for Martynia. 



TABLE 4 



Percentage of soil moisture at the time of wilting of similar plants of Physalis 

 exposed to different evaporation conditions 



